JP2021112699A - Anaerobic digestion system and anaerobic digestion method - Google Patents

Anaerobic digestion system and anaerobic digestion method Download PDF

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JP2021112699A
JP2021112699A JP2020005969A JP2020005969A JP2021112699A JP 2021112699 A JP2021112699 A JP 2021112699A JP 2020005969 A JP2020005969 A JP 2020005969A JP 2020005969 A JP2020005969 A JP 2020005969A JP 2021112699 A JP2021112699 A JP 2021112699A
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sludge
anaerobic digestion
heat exchanger
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digestion tank
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恵之 正木
Toshiyuki Masaki
恵之 正木
元 栗原
Hajime Kurihara
元 栗原
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Mitsubishi Kakoki Kaisha Ltd
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Abstract

To provide an anaerobic digestion system and anaerobic digestion method capable of maintaining a good agitation state in the anaerobic digestion tank, reducing unevenness in the temperature of digested sludge, and performing good anaerobic digestion.SOLUTION: An anaerobic digestion system S includes a heat exchanger 2 in which the sludge to be treated is heated, an anaerobic digestion tank 3 in which the sludge heated in the heat exchanger 2 is anaerobically digested, and circulation means k4, k5, k6, k7, 5, 6 in which the digested sludge anaerobically digested in the anaerobic digestion tank 3 is merged with the sludge to be treated before being heated in the heat exchanger 2.SELECTED DRAWING: Figure 1

Description

本発明は、嫌気性消化システムおよび嫌気性消化方法に関する。 The present invention relates to an anaerobic digestion system and an anaerobic digestion method.

図６に、従来の下水汚泥の消化設備の模式図を示す。
従来、下水汚泥の消化設備の関連施設では、下水汚泥を含む流入水が最初沈殿池１０２、反応槽１０３、最終沈殿池１０４の順に送られる。
最初沈殿池１０２では、自然沈降が行われ、固形物濃度が１〜２％に濃縮される。下水汚泥を含む流入水は、最初沈殿池１０２で、上澄み液と沈殿物の汚泥(以下、初沈汚泥と称す)とに分離される。 FIG. 6 shows a schematic diagram of a conventional sewage sludge digestion facility.
Conventionally, in the facility related to the sewage sludge digestion facility, the inflow water containing the sewage sludge is sent in the order of the first settling basin 102, the reaction tank 103, and the final settling basin 104.
In the first sedimentation basin 102, natural sedimentation is performed and the solid matter concentration is concentrated to 1 to 2%. The inflow water containing the sewage sludge is first separated into the supernatant liquid and the sediment sludge (hereinafter referred to as the first settling sludge) in the settling basin 102.

上澄み液は反応槽１０２に送られ、反応槽１０２で好気性微生物により好気処理が行われる。
最終沈殿池１０４では、好気処理が行われた処理液が、上澄み液と、沈殿物の汚泥(以下、余剰汚泥と称す)とに分離され、余剰汚泥は機械濃縮により固形物濃度で３〜６％に濃縮される。
最初沈殿池１０２の初沈汚泥が濃縮された濃縮初沈汚泥は、ポンプＰ１１により、ラインｋ１１を経由して、嫌気性消化槽１０１に送られる。 The supernatant is sent to the reaction tank 102, where aerobic treatment is performed by aerobic microorganisms.
In the final settling basin 104, the aerobic treatment liquid is separated into the supernatant liquid and the sludge of the sediment (hereinafter referred to as surplus sludge), and the surplus sludge is mechanically concentrated to have a solid content concentration of 3 to 3. Concentrated to 6%.
The concentrated initial sludge in which the initial sludge in the initial sedimentation basin 102 is concentrated is sent to the anaerobic digestion tank 101 by the pump P11 via the line k11.

また、最終沈殿池１０４の余剰汚泥が濃縮された濃縮余剰汚泥は、ポンプＰ１２により、ラインｋ１１を経由して、嫌気性消化槽１０１に送られる。
嫌気性消化槽１０１では、嫌気性消化処理が行われる。嫌気性消化処理は、３５〜３８℃で消化日数(初沈汚泥、余剰汚泥の当該タンクの滞留日数)が２０〜３０日の中温消化と、５０〜５５℃で消化日数が１０〜２０日の高温消化とがある。 Further, the concentrated excess sludge in which the excess sludge in the final settling basin 104 is concentrated is sent to the anaerobic digestion tank 101 by the pump P12 via the line k11.
In the anaerobic digestion tank 101, an anaerobic digestion process is performed. Anaerobic digestion treatment is medium temperature digestion with a digestion period of 20 to 30 days at 35 to 38 ° C (the number of days of residence of the initial sludge and excess sludge in the tank) and 10 to 20 days at 50 to 55 ° C. There is high temperature digestion.

嫌気性消化槽１０１での嫌気性微生物による消化の温度を維持するために、外部から熱を、消化汚泥が嫌気性消化槽１０１に循環する循環ラインｊ１１を通して、嫌気性消化槽１０１内に供給して加温している。循環ラインｊ１１には、嫌気性消化槽１０１の消化汚泥を加温するための熱交換器１０５と、消化汚泥を熱交換器１０５に送る循環ポンプＰ１３とが、設けられている。 In order to maintain the temperature of digestion by anaerobic microorganisms in the anaerobic digestion tank 101, heat is supplied from the outside into the anaerobic digestion tank 101 through the circulation line j11 in which the digestive sludge circulates in the anaerobic digestion tank 101. It is warming up. The circulation line j11 is provided with a heat exchanger 105 for heating the digested sludge of the anaerobic digestion tank 101 and a circulation pump P13 for sending the digested sludge to the heat exchanger 105.

投入汚泥の嫌気性消化槽１０１への投入は、通常、加温のための消化汚泥の循環ラインｊ１１とは別途にラインｋ１１から投入される。
前記したように、投入汚泥は、通常、固形物濃度が２〜６％に濃縮された状態である。 The input sludge is usually input from the line k11 separately from the circulation line j11 of the digested sludge for heating.
As described above, the input sludge is usually in a state where the solid matter concentration is concentrated to 2 to 6%.

一方、図６の構成と異なり、嫌気性消化槽１０１への汚泥の投入に際して、予め熱交換器を経由して、加温してからの濃縮初沈汚泥と濃縮余剰汚泥の嫌気性消化槽１０１への投入は、次の問題が生じる。すなわち、熱交換器における投入汚泥中のし渣による閉塞や、熱交換器の伝熱面に投入汚泥中のワックス状の油分が付着する。また、投入汚泥が約２０〜３０℃(冬季は約１０〜２０℃)であり、投入汚泥が約５０℃の伝熱面にへばり付く。
したがって、熱交換器での熱交換量の不足が生じるため、予め熱交換器を経由して、加温してからの投入汚泥（濃縮初沈汚泥、濃縮余剰汚泥）の嫌気性消化槽１０１への投入は近年、実施されていない。 On the other hand, unlike the configuration of FIG. 6, when the sludge is put into the anaerobic digestion tank 101, the anaerobic digestion tank 101 of the concentrated initial sludge and the concentrated excess sludge after being heated in advance via a heat exchanger The following problems arise when the input is made into. That is, the heat exchanger is blocked by the residue in the input sludge, and the wax-like oil in the input sludge adheres to the heat transfer surface of the heat exchanger. Further, the input sludge is about 20 to 30 ° C. (about 10 to 20 ° C. in winter), and the input sludge sticks to the heat transfer surface at about 50 ° C.
Therefore, since the amount of heat exchanged in the heat exchanger is insufficient, the sludge input after heating (concentrated initial sludge, concentrated excess sludge) is sent to the anaerobic digestion tank 101 via the heat exchanger in advance. Has not been introduced in recent years.

ところで、嫌気性消化槽１０１における消化を効率的に行うため、嫌気性消化槽１０１に貯留される消化汚泥の撹拌が行われる。
嫌気性消化槽１０１における消化汚泥の撹拌については、古くから採用されてきたガス撹拌に代わって、低動力なインペラー型機械撹拌装置の採用が増えている。 By the way, in order to efficiently perform digestion in the anaerobic digestion tank 101, the digestive sludge stored in the anaerobic digestion tank 101 is agitated.
Regarding the agitation of digested sludge in the anaerobic digestion tank 101, the adoption of a low-power impeller-type mechanical agitator is increasing in place of the gas agitation that has been adopted for a long time.

嫌気性消化槽１０１の加温については、気性消化槽１０１内に直接蒸気を吹き込む方式と、図６に示す消化汚泥を循環ラインｊ１１に循環させて、循環ラインｊ１１に設置した熱交換器１０５で、温水と消化汚泥とが熱交換を行う間接加温式がある。
嫌気性消化槽１０１における消化汚泥中のし渣の塊りが大きくなるのを抑制するための破砕については、間接加温のための循環ラインｊ１１において、熱交換器１０５を経由する前にカッター(図示せず)が設置されることがある。 Regarding the heating of the anaerobic digestion tank 101, a method of blowing steam directly into the aerobic digestion tank 101 and a heat exchanger 105 installed in the circulation line j11 by circulating the digestive sludge shown in FIG. 6 through the circulation line j11. , There is an indirect heating system in which hot water and digestive sludge exchange heat.
For crushing in order to prevent the mass of the residue in the digestive sludge in the anaerobic digestion tank 101 from becoming large, the cutter (in the circulation line j11 for indirect heating, before passing through the heat exchanger 105, is used. (Not shown) may be installed.

下水道施設計画・設計指針と解説−2009年版_後編P350((社)日本下水道協会)Sewerage Facility Planning / Design Guidelines and Explanations-2009 Edition_Part 2 P350 (Japan Sewerage Association)

昨今、余剰汚泥を固形化する高分子凝集剤のコストが以前に比べて大きく低下している。そのため、嫌気性消化槽１０１に投入前の汚泥の水分を、遠心濃縮機のように動力をかけて除去して濃縮するより、高分子凝集剤を加えた投入汚泥をベルトや浮上分離で高濃度に汚泥を濃縮する方法が広まりつつある。つまり、下水汚泥の嫌気性消化設備において、高分子凝集剤を用いて(消化槽への)投入汚泥を濃縮することにより高濃度化し、嫌気性消化槽１０１内の固形物濃度を高くするいわゆる「高濃度消化プロセス」が採用されつつある。 Nowadays, the cost of polymer flocculants that solidify excess sludge is much lower than before. Therefore, rather than removing the water content of the sludge before it is charged into the anaerobic digestion tank 101 by applying power like a centrifugal concentrator and concentrating it, the charged sludge containing a polymer flocculant is concentrated by a belt or floating separation. The method of concentrating sludge is becoming widespread. That is, in the anaerobic digestion facility for sewage sludge, the concentration of the input sludge (to the digestion tank) is increased by using a polymer flocculant to increase the concentration of the solid matter in the anaerobic digestion tank 101. "High-concentration digestion process" is being adopted.

一方、前記したように、消化槽の撹拌設備は、古くからガス撹拌に代わって、低動力なインペラー型機械撹拌装置の採用が増えている。
ところが、高分子凝集剤を含んだ濃縮汚泥は、高粘度でスライム化した汚泥で分散性が悪い。
これにより、嫌気性消化槽１０１内での撹拌が難しく、槽(１０１)内に既にある消化汚泥と新たに投入される投入汚泥がうまく混合できずに温度むらが生じる場合がある。その結果、汚泥の消化に支障をきたし、汚泥の発泡現象が生じ、消化率が低下する。つまり、投入汚泥が消化されることで回収できる消化ガスの量が低下する問題がある。 On the other hand, as described above, as the stirring equipment of the digestive tank, the adoption of a low-power impeller type mechanical stirring device has been increasing in place of gas stirring for a long time.
However, concentrated sludge containing a polymer flocculant is a sludge that is highly viscous and slime, and has poor dispersibility.
As a result, it is difficult to stir in the anaerobic digestion tank 101, and the digestion sludge already in the tank (101) and the newly introduced sludge may not be mixed well, resulting in temperature unevenness. As a result, the digestion of sludge is hindered, the foaming phenomenon of sludge occurs, and the digestibility is lowered. That is, there is a problem that the amount of digestive gas that can be recovered is reduced by digesting the input sludge.

さらに、インペラー型機械撹拌装置の採用により、投入汚泥に含まれるし渣がインペラーに絡みついて、経年と共に成長し撹拌状態が著しく低下するケースもある。
本発明は上記実状に鑑み創案されたものであり、嫌気性消化槽の撹拌状態を良好に保ち、消化汚泥の温度むらを小さくして、良好な嫌気性消化を行える嫌気性消化システムおよび嫌気性消化方法の提供を目的とする。 Further, by adopting an impeller type mechanical agitator, there is a case where the residue contained in the input sludge is entangled with the impeller and grows with aging and the agitated state is significantly deteriorated.
The present invention has been devised in view of the above circumstances, and is an anaerobic digestion system and anaerobic digestion system capable of performing good anaerobic digestion by maintaining a good stirring state of the anaerobic digestion tank and reducing the temperature unevenness of digestive sludge. The purpose is to provide a digestive method.

前記課題を解決するため、第１の本発明の嫌気性消化システムは、処理対象の汚泥が加温される熱交換器と、前記熱交換器で加温された前記汚泥が、嫌気性消化される嫌気性消化槽と、前記嫌気性消化槽で嫌気性消化された消化汚泥を、前記熱交換器で加温される前の前記処理対象の汚泥と合流させる循環手段とを備えている。 In order to solve the above problems, in the first anaerobic digestion system of the present invention, a heat exchanger in which the sludge to be treated is heated and the sludge heated by the heat exchanger are anaerobic digested. It is provided with an anaerobic digestion tank and a circulation means for merging the digested sludge anaerobic digested in the anaerobic digestion tank with the sludge to be treated before being heated by the heat exchanger.

第２の本発明の嫌気性消化方法は、熱交換器と嫌気性消化槽と循環手段とを用いて、処理対象の汚泥を嫌気性消化処理する嫌気性消化方法であって、汚泥が前記熱交換器で加温される過程と、加温された前記汚泥が前記嫌気性消化槽で嫌気性微生物により嫌気性消化される過程と、前記嫌気性消化槽の消化汚泥が前記循環手段により、前記熱交換器の上流の前記処理対象の汚泥に合流させる過程とを含む。 The second anaerobic digestion method of the present invention is an anaerobic digestion method for anaerobic digesting the sludge to be treated by using a heat exchanger, an anaerobic digestor and a circulating means, and the sludge is the heat. The process of heating in the exchanger, the process of anaerobic digestion of the heated sludge by the anaerobic digestor in the anaerobic digestion tank, and the process of digesting the digested sludge in the anaerobic digestion tank by the circulation means. It includes a process of merging with the sludge to be treated upstream of the heat exchanger.

本発明によれば、嫌気性消化槽の撹拌状態を良好に保ち、消化汚泥の温度むらを小さくして、良好な嫌気性消化を行える嫌気性消化システムおよび嫌気性消化方法を提供することができる。 According to the present invention, it is possible to provide an anaerobic digestion system and an anaerobic digestion method capable of maintaining a good stirring state of an anaerobic digestion tank, reducing the temperature unevenness of digestive sludge, and performing good anaerobic digestion. ..

本発明の実施形態に係る嫌気性消化システムの構成の模式図。The schematic diagram of the structure of the anaerobic digestion system which concerns on embodiment of this invention. 嫌気性消化システムにおいて投入汚泥が投入されるモードの構成を示す図。The figure which shows the structure of the mode in which the input sludge is input in the anaerobic digestion system. 嫌気性消化システムにおいて投入汚泥が投入されないモードの構成を示す図。The figure which shows the structure of the mode in which the input sludge is not input in the anaerobic digestion system. 嫌気性消化システムにおける嫌気性消化槽の内部で消化汚泥にし渣が多く混入する場合の管路を示す図。The figure which shows the pipeline when a large amount of residue is mixed with digestive sludge inside an anaerobic digestion tank in an anaerobic digestion system. 変形例の嫌気性消化システムの構成の模式図。Schematic diagram of the configuration of the anaerobic digestion system of the modified example. 従来の下水汚泥の消化設備の模式図。Schematic diagram of the conventional sewage sludge digestion equipment.

以下、本発明の実施形態について、適宜図面を参照しながら詳細に説明する。
図１に、本発明の実施形態に係る嫌気性消化システムＳの構成の模式図を示す。
実施形態の嫌気性消化システムＳは、図６に示す初沈汚泥と余剰汚泥とである投入汚泥(処理対象の汚泥)を処理するシステムである。
初沈汚泥は、流入水が最初沈殿池１０２で沈降した汚泥である。
余剰汚泥は、流入水が最初沈殿池１０２、反応槽１０３を通過して最終沈殿池１０４で自然沈降した汚泥である。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 shows a schematic diagram of the configuration of the anaerobic digestion system S according to the embodiment of the present invention.
The anaerobic digestion system S of the embodiment is a system for treating the input sludge (sludge to be treated) which is the initial sludge and the surplus sludge shown in FIG.
The first settling sludge is the sludge in which the inflow water first settles in the settling basin 102.
The surplus sludge is sludge in which the inflow water first passes through the settling basin 102 and the reaction tank 103 and naturally settles in the final settling basin 104.

なお、投入汚泥(処理対象の汚泥)は、初沈汚泥、余剰汚泥またはそれぞれの濃縮された汚泥の何れかでもよい。
実施形態の嫌気性消化システムＳは、投入汚泥が処理される順に、破砕機１、熱交換器２、および嫌気性消化槽３が管路ｋ１、ｋ２、ｋ３で接続されている。
破砕機１のカッターは、投入汚泥に含まれるし渣等を破砕する。カッターの型式としては、一つのモータで刃を駆動する一軸式と、二つのモータで刃が互いに噛み合う二軸式とがある。投入汚泥のし渣を破砕することで、熱交換器２の詰まりや、後記する嫌気性消化槽３のインペラー４ｉ１、４ｉ２へのし渣の絡み付きが抑制される。 The input sludge (sludge to be treated) may be either initial sludge, excess sludge, or each concentrated sludge.
In the anaerobic digestion system S of the embodiment, the crusher 1, the heat exchanger 2, and the anaerobic digestion tank 3 are connected by pipelines k1, k2, and k3 in the order in which the input sludge is treated.
The cutter of the crusher 1 crushes the residue and the like contained in the input sludge. There are two types of cutters: a uniaxial type that drives the blade with one motor and a biaxial type that the blades mesh with each other with two motors. By crushing the residue of the input sludge, clogging of the heat exchanger 2 and entanglement of the residue with the impellers 4i1 and 4i2 of the anaerobic digestion tank 3 described later are suppressed.

熱交換器２は、破砕機１で破砕された投入汚泥を下流の嫌気性消化槽３での消化に適した温度に加温する。破砕機１で破砕された投入汚泥は、熱交換器２で温水と熱交換され加温される。
嫌気性消化槽３では、破砕されかつ加温された汚泥を嫌気性微生物で消化して減容する。嫌気性消化槽３で、投入汚泥の有機固形物のうち約５０％(範囲で示す場合は３０〜７０％)が減容される。
嫌気性消化槽３での消化には、約３５〜４０℃が適温の中温消化と、約５０〜５５℃が適温の高温消化とがある。 The heat exchanger 2 heats the input sludge crushed by the crusher 1 to a temperature suitable for digestion in the downstream anaerobic digestion tank 3. The input sludge crushed by the crusher 1 is heat-exchanged with hot water by the heat exchanger 2 to be heated.
In the anaerobic digestion tank 3, the crushed and heated sludge is digested with anaerobic microorganisms to reduce the volume. In the anaerobic digestion tank 3, about 50% (30 to 70% in the range) of the organic solid matter of the input sludge is reduced.
Digestion in the anaerobic digestion tank 3 includes medium-temperature digestion at an appropriate temperature of about 35 to 40 ° C. and high-temperature digestion at an appropriate temperature of about 50 to 55 ° C.

中温消化を行う場合は、熱交換器２で破砕された投入汚泥を約３５〜４５℃に加温する。
高温消化を行う場合は、熱交換器２で破砕された投入汚泥を約５０〜６０℃に加温する。
嫌気性消化槽３には、インペラー型機械撹拌装置４が設けられている。
インペラー型機械撹拌装置４は、インペラー４ｉ１、４ｉ２が軸４ｊに固定されている。軸４ｊは、モータ４ｍで回転駆動される。なお、インペラーの枚数については、型式により異なるが、図１では例として２枚の図としている。
インペラー型機械撹拌装置４は、嫌気性消化槽３内の破砕され加温された投入汚泥を、２枚のインペラー４ｉ１、４ｉ２で撹拌し、温度を均一にする。 When performing medium temperature digestion, the input sludge crushed by the heat exchanger 2 is heated to about 35 to 45 ° C.
When high temperature digestion is performed, the input sludge crushed by the heat exchanger 2 is heated to about 50 to 60 ° C.
The anaerobic digestion tank 3 is provided with an impeller type mechanical agitator 4.
In the impeller type mechanical agitator 4, the impellers 4i1 and 4i2 are fixed to the shaft 4j. The shaft 4j is rotationally driven by the motor 4m. The number of impellers varies depending on the model, but in FIG. 1, two impellers are shown as an example.
The impeller type mechanical agitator 4 agitates the crushed and heated input sludge in the anaerobic digestion tank 3 with two impellers 4i1 and 4i2 to make the temperature uniform.

投入汚泥が熱交換器２で加温されることで、嫌気性消化槽３での汚泥の温度が均一化し、嫌気性消化槽３での消化効率が向上する。また、投入汚泥が加温されることで粘性が低下し、嫌気性消化槽３での撹拌が円滑に行える。
嫌気性消化槽３の下部には管路ｋ４が接続されている。嫌気性消化槽３は、管路ｋ４を介して、循環ポンプ５に接続されている。管路ｋ４には、嫌気性消化槽３で消化された消化汚泥を抜き取るための管路ｋ４１が接続されている。嫌気性消化槽３で消化された消化汚泥は、一部がオーバーフローで、嫌気性消化槽３から抜き取られる。 By heating the input sludge in the heat exchanger 2, the temperature of the sludge in the anaerobic digestion tank 3 becomes uniform, and the digestion efficiency in the anaerobic digestion tank 3 is improved. Further, the viscosity of the input sludge is reduced by heating the sludge, and the anaerobic digestion tank 3 can be smoothly stirred.
A conduit k4 is connected to the lower part of the anaerobic digestion tank 3. The anaerobic digestion tank 3 is connected to the circulation pump 5 via the pipe line k4. A pipe k41 for extracting digestive sludge digested in the anaerobic digestion tank 3 is connected to the pipe k4. The digested sludge digested in the anaerobic digestion tank 3 is partially overflowed and is extracted from the anaerobic digestion tank 3.

嫌気性消化システムＳでは、投入汚泥が投入される場合(投入モード)と、投入汚泥が投入されない場合の何れの場合(非投入モード)にも対応するため、三方弁６等のバルブが設けられている。バルブは、投入汚泥が投入される場合と、投入汚泥が投入されない場合とでの切り替えを可能とする。 In the anaerobic digestion system S, a valve such as a three-way valve 6 is provided in order to cope with both the case where the input sludge is input (the input mode) and the case where the input sludge is not charged (non-input mode). ing. The valve makes it possible to switch between the case where the input sludge is charged and the case where the input sludge is not charged.

図１では、バルブとして三方弁６が設けられた場合を示している。以下、バルブとして三方弁６が設けられているとして説明を行う。
そのため、循環ポンプ５は、管路ｋ５を介して三方弁６に接続されている。
三方弁６は、嫌気性消化槽３で嫌気性消化された消化汚泥を破砕機１または熱交換器２に送り、循環させる役割をもつ。 FIG. 1 shows a case where a three-way valve 6 is provided as a valve. Hereinafter, it will be described assuming that the three-way valve 6 is provided as a valve.
Therefore, the circulation pump 5 is connected to the three-way valve 6 via the pipeline k5.
The three-way valve 6 has a role of sending the digested sludge anaerobic digested in the anaerobic digestion tank 3 to the crusher 1 or the heat exchanger 2 and circulating it.

そこで、三方弁６は、管路ｋ６を介して、破砕機１の上流の管路ｋ１に接続されている。また、三方弁６は、管路ｋ７を介して、熱交換器２の上流の管路ｋ２に接続されている。投入汚泥が投入されない場合には、三方弁６を用いて、嫌気性消化槽３で消化されつつある消化汚泥が熱交換器２に送られ、循環が行われる。これによって、投入汚泥と消化汚泥中の菌体が嫌気性消化槽３への投入前に混合される。また、温度が高い消化汚泥と高粘度の投入汚泥を混合することで低粘性化し、その混合汚泥を、破砕機１を介して嫌気性消化槽３へ投入することが可能となる。 Therefore, the three-way valve 6 is connected to the upstream pipeline k1 of the crusher 1 via the pipeline k6. Further, the three-way valve 6 is connected to the upstream pipeline k2 of the heat exchanger 2 via the conduit k7. When the input sludge is not charged, the digested sludge being digested in the anaerobic digestion tank 3 is sent to the heat exchanger 2 by using the three-way valve 6, and circulation is performed. As a result, the input sludge and the bacterial cells in the digested sludge are mixed before being charged into the anaerobic digestion tank 3. Further, the viscosity is reduced by mixing the digested sludge having a high temperature and the charged sludge having a high viscosity, and the mixed sludge can be charged into the anaerobic digestion tank 3 via the crusher 1.

＜嫌気性消化システムＳの動作モード＞
次に、嫌気性消化システムＳの動作モードについて説明する。
嫌気性消化システムＳは、投入汚泥が投入される場合(投入モード)（図１の一点鎖線で示す）と、投入汚泥が投入されない場合(非投入モード)（図１の破線で示す）との２つのモードを有している。 <Operation mode of anaerobic digestion system S>
Next, the operation mode of the anaerobic digestion system S will be described.
The anaerobic digestion system S has a case where the input sludge is charged (addition mode) (indicated by the alternate long and short dash line in FIG. 1) and a case where the input sludge is not charged (non-input mode) (indicated by the broken line in FIG. 1). It has two modes.

図２に嫌気性消化システムＳにおいて投入汚泥が投入されるモードの構成を示し、図３に嫌気性消化システムＳにおいて投入汚泥が投入されないモードの構成を示す。
＜投入汚泥が投入される投入モード＞ FIG. 2 shows the configuration of the mode in which the input sludge is charged in the anaerobic digestion system S, and FIG. 3 shows the configuration of the mode in which the input sludge is not charged in the anaerobic digestion system S.
<Injection mode in which input sludge is input>

図１の一点鎖線、図２で示す投入汚泥が投入される場合(投入モード)について、説明する。
投入汚泥が投入される投入モードでは、三方弁６は管路ｋ５と管路ｋ６とを接続する。
投入汚泥は、濃縮のため高分子凝集剤が加えられていて粘性が高くなっている。
投入汚泥は、常温で、管路ｋ１を通って、破砕機１に送られる。破砕機１により、投入汚泥のし渣がカッティングされる。カッティングされた投入汚泥は、管路ｋ２を通って、熱交換器２に送られる。カッティングされた投入汚泥は、熱交換器２で温水と熱交換され、嫌気性消化槽３での消化に適した温度になるように加温される。 The case where the charged sludge shown in FIG. 2 and the alternate long and short dash line in FIG. 1 is charged (charge mode) will be described.
In the charging mode in which the charging sludge is charged, the three-way valve 6 connects the pipeline k5 and the pipeline k6.
The input sludge has a high viscosity due to the addition of a polymer flocculant for concentration.
The input sludge is sent to the crusher 1 through the pipeline k1 at room temperature. The crusher 1 cuts the residue of the input sludge. The cut sludge is sent to the heat exchanger 2 through the pipeline k2. The cut sludge is heat-exchanged with hot water in the heat exchanger 2 and heated to a temperature suitable for digestion in the anaerobic digestion tank 3.

加温された投入汚泥は、管路ｋ３を通って、嫌気性消化槽３に送られる。
嫌気性消化槽３の投入汚泥は、嫌気性消化槽３において、インペラー型機械撹拌装置４の２枚のインペラー４ｉ１、４ｉ２で撹拌されつつ、嫌気性微生物(メタン菌)で消化される。これにより、メタンガスと二酸化炭素とが発生し、投入汚泥が減容される。
嫌気性消化槽３で消化されつつある消化汚泥は、管路ｋ４を通って、循環ポンプ５に圧送される。消化汚泥は、循環ポンプ５により、圧力を加えられ、管路ｋ５、三方弁６、管路ｋ６を通って、投入汚泥が投入される管路ｋ１に送られる。 The heated input sludge is sent to the anaerobic digestion tank 3 through the conduit k3.
The input sludge in the anaerobic digestion tank 3 is digested by anaerobic microorganisms (methane bacteria) in the anaerobic digestion tank 3 while being stirred by the two impellers 4i1 and 4i2 of the impeller type mechanical agitator 4. As a result, methane gas and carbon dioxide are generated, and the volume of input sludge is reduced.
The digested sludge being digested in the anaerobic digestion tank 3 is pumped to the circulation pump 5 through the pipeline k4. The digested sludge is pressurized by the circulation pump 5 and sent to the pipe k1 to which the input sludge is charged through the pipe k5, the three-way valve 6, and the pipe k6.

そして、新たに投入される投入汚泥は、管路ｋ１で、消化汚泥と混合され、破砕機１、熱交換器２、および嫌気性消化槽３の順に送られる。
以後、上述と同様な動作が繰り返される。 Then, the newly introduced sludge is mixed with the digestion sludge in the pipeline k1 and sent to the crusher 1, the heat exchanger 2, and the anaerobic digestion tank 3 in this order.
After that, the same operation as described above is repeated.

上述の投入汚泥が投入される投入モードの構成によれば、濃縮のために高分子凝集剤が加えられ粘性が高くなっている投入汚泥を、投入前に循環汚泥(消化汚泥)と混合し (消化汚泥とプレ混合し)、嫌気性消化槽３への投入前に熱交換器２で加温する。これにより、早期にメタン菌と投入汚泥が接触する。また、加温により、投入汚泥が低粘性化され、嫌気性消化槽３の内部での撹拌状態が改善される。また、投入汚泥が消化に適した温度に加温されるので、消化効率が向上する。 According to the configuration of the charging mode in which the input sludge is charged as described above, the input sludge having a high viscosity due to the addition of a polymer flocculant for concentration is mixed with the circulating sludge (digestion sludge) before charging (digestion sludge). It is premixed with digestive sludge) and heated by the heat exchanger 2 before being put into the anaerobic digestion tank 3. As a result, the methane bacteria and the input sludge come into contact with each other at an early stage. Further, the heating reduces the viscosity of the input sludge and improves the stirring state inside the anaerobic digestion tank 3. In addition, since the input sludge is heated to a temperature suitable for digestion, digestion efficiency is improved.

破砕機１により、投入汚泥のし渣を破砕してからの嫌気性消化槽３への投入となるため、し渣のインペラー４ｉ１、４ｉ２への絡みつきが減り、インペラー４ｉ１、４ｉ２の撹拌能力を維持することができる。また、熱交換器２に入る前に、投入汚泥のし渣が破砕機１により破砕されるので、熱交換器２でのし渣による閉塞も軽減できる。
前記したように、従来、投入汚泥をそのまま、熱交換器を通して加温すると熱交換器の伝熱面にワックス状の油分が付着し、熱交換器の閉塞や、熱交換量の不足の起因となっていた。 Since the crusher 1 crushes the sludge residue and then inputs it to the anaerobic digestion tank 3, the entanglement of the residue with the impellers 4i1 and 4i2 is reduced, and the stirring capacity of the impellers 4i1 and 4i2 is maintained. can do. Further, since the residue of the input sludge is crushed by the crusher 1 before entering the heat exchanger 2, the blockage due to the residue in the heat exchanger 2 can be reduced.
As described above, conventionally, when the input sludge is heated through the heat exchanger as it is, wax-like oil adheres to the heat transfer surface of the heat exchanger, which causes the heat exchanger to be blocked and the amount of heat exchange to be insufficient. It was.

これに対して、本実施形態の嫌気性消化システムＳでは、図１の一点鎖線、図２に示すように、投入汚泥が熱交換器２の伝熱面を通過する前に、管路ｋ４、循環ポンプ５、管路ｋ５、三方弁６、管路ｋ６を循環する消化汚泥と混合されて、投入汚泥由来の油分が希釈されている。
また、嫌気性消化槽３の内部で成長したボール状のし渣を、破砕機１に還流させてボール状のし渣を微細化し、嫌気性消化槽３へ返流する。これにより、インペラー４ｉ１、４ｉ２へのし渣の絡みつきによる撹拌機能低下を抑制できる。 On the other hand, in the anaerobic digestion system S of the present embodiment, as shown in the one-point chain line of FIG. The oil content derived from the input sludge is diluted by being mixed with the digested sludge circulating in the circulation pump 5, the pipeline k5, the three-way valve 6, and the pipeline k6.
Further, the ball-shaped residue grown inside the anaerobic digestion tank 3 is refluxed to the crusher 1 to make the ball-shaped residue finer, and then returned to the anaerobic digestion tank 3. As a result, it is possible to suppress a decrease in the stirring function due to entanglement of the residue with the impellers 4i1 and 4i2.

＜投入汚泥が投入されない非投入モード＞
図１の破線、図３に示す投入汚泥が投入されない場合(非投入モード)について、説明する。
投入汚泥が投入されない非投入モードでは、三方弁６は管路ｋ５と管路ｋ７とを接続する。
これにより、熱交換器２、嫌気性消化槽３、循環ポンプ５が接続される閉管路が形成される。 <Non-input mode in which input sludge is not input>
The case where the charged sludge shown in the broken line of FIG. 1 and FIG. 3 is not charged (non-charged mode) will be described.
In the non-input mode in which the input sludge is not charged, the three-way valve 6 connects the pipeline k5 and the pipeline k7.
As a result, a closed conduit is formed to which the heat exchanger 2, the anaerobic digestion tank 3, and the circulation pump 5 are connected.

非投入モードでは、嫌気性消化槽３で消化されつつある消化汚泥が、嫌気性消化槽３から、管路ｋ４、循環ポンプ５、管路ｋ５、三方弁６、管路ｋ７、管路ｋ２、熱交換器２、管路ｋ３、嫌気性消化槽３を循環する。
消化汚泥は、熱交換器２を通ることで、嫌気性消化槽３での消化に適した温度に加温される。そのため、嫌気性消化槽３での消化汚泥の消化が促進される。
非投入モードでは、熱交換器２の伝熱面を消化汚泥が通ることで、伝熱面に油分が付着することを抑制できる。 In the non-input mode, the digested sludge being digested in the anaerobic digestion tank 3 is discharged from the anaerobic digestion tank 3 from the anaerobic digestion tank 3, the conduit k4, the circulation pump 5, the conduit k5, the three-way valve 6, the conduit k7, the conduit k2, It circulates in the heat exchanger 2, the conduit k3, and the anaerobic digestion tank 3.
The digested sludge is heated to a temperature suitable for digestion in the anaerobic digestion tank 3 by passing through the heat exchanger 2. Therefore, the digestion of digested sludge in the anaerobic digestion tank 3 is promoted.
In the non-input mode, the digestive sludge passes through the heat transfer surface of the heat exchanger 2, so that oil content can be suppressed from adhering to the heat transfer surface.

また、消化汚泥が管路ｋ２、熱交換器２、管路ｋ３、嫌気性消化槽３を循環するので、管路ｋ２、熱交換器２、管路ｋ３、嫌気性消化槽３の洗浄頻度、メンテナンス頻度を低減することができる。 Further, since the digested sludge circulates in the pipe line k2, the heat exchanger 2, the pipe line k3, and the anaerobic digestion tank 3, the cleaning frequency of the pipe line k2, the heat exchanger 2, the pipe line k3, and the anaerobic digestion tank 3 is determined. The maintenance frequency can be reduced.

＜嫌気性消化槽３に固形物の塊りが発生した場合＞
次に、嫌気性消化槽３の内部でし渣等による固形物の塊りが発生した場合について、説明する。 <When a lump of solid matter occurs in the anaerobic digestion tank 3>
Next, a case where a lump of solid matter due to residue or the like is generated inside the anaerobic digestion tank 3 will be described.

図４に、嫌気性消化システムＳの嫌気性消化槽３の内部で消化液へのし渣の混入が多い場合の管路を示す。
嫌気性消化槽３の内部で消化液へのし渣の混入が多い場合には、三方弁６は管路ｋ５と管路ｋ６とを接続して、嫌気性消化槽３の消化汚泥を破砕機１に循環させる。
この場合、嫌気性消化槽３で消化されつつある消化汚泥が、嫌気性消化槽３から、管路ｋ４、循環ポンプ５、管路ｋ５、三方弁６、管路ｋ６、管路ｋ１を通り、破砕機１、熱交換器２、嫌気性消化槽３を循環する。 FIG. 4 shows a conduit in the case where a large amount of residue is mixed in the digestive juice inside the anaerobic digestion tank 3 of the anaerobic digestion system S.
When there is a large amount of residue mixed in the digestive juice inside the anaerobic digestion tank 3, the three-way valve 6 connects the pipe line k5 and the pipe line k6 to crush the digestive sludge of the anaerobic digestion tank 3. Circulate to 1.
In this case, the digested sludge being digested in the anaerobic digestion tank 3 passes from the anaerobic digestion tank 3 through the conduit k4, the circulation pump 5, the conduit k5, the three-way valve 6, the conduit k6, and the conduit k1. It circulates in the crusher 1, the heat exchanger 2, and the anaerobic digestion tank 3.

消化汚泥が破砕機１を通ることで、し渣等が破砕機１で破砕される。そのため、嫌気性消化槽３の内部の固形物の塊りが無くなり、嫌気性消化槽３でのインペラー型機械撹拌装置４のインペラー４ｉ１、４ｉ２による撹拌が滞りなく円滑に行われる。
消化汚泥は、熱交換器２を通ることで、嫌気性消化槽３での消化に適した温度に加温される。そのため、嫌気性消化槽３での消化汚泥の消化が促進される。
また、熱交換器２の伝熱面を破砕された消化汚泥が通ることで、伝熱面に油分が付着することを抑制できる。さらに、熱交換器２の詰まりを抑制できる。 When the digested sludge passes through the crusher 1, the residue and the like are crushed by the crusher 1. Therefore, the lump of solid matter inside the anaerobic digestion tank 3 disappears, and the impellers 4i1 and 4i2 of the impeller type mechanical stirring device 4 in the anaerobic digestion tank 3 smoothly perform stirring without delay.
The digested sludge is heated to a temperature suitable for digestion in the anaerobic digestion tank 3 by passing through the heat exchanger 2. Therefore, the digestion of digested sludge in the anaerobic digestion tank 3 is promoted.
Further, by passing the crushed digestive sludge through the heat transfer surface of the heat exchanger 2, it is possible to prevent oil from adhering to the heat transfer surface. Further, clogging of the heat exchanger 2 can be suppressed.

以上説明した構成によれば、嫌気性消化槽３の撹拌状態を良好に保ち、嫌気性消化槽３内の温度むらを小さくして、良好な嫌気性消化を維持できる嫌気性消化システムＳを得られる。 According to the configuration described above, the anaerobic digestion system S capable of maintaining a good anaerobic digestion by maintaining a good stirring state of the anaerobic digestion tank 3 and reducing the temperature unevenness in the anaerobic digestion tank 3 is obtained. Be done.

＜変形例＞
図５に、変形例の嫌気性消化システムＳ１の構成の模式図を示す。
変形例の嫌気性消化システムＳ１は、図１に示す実施形態の嫌気性消化システムＳにおける三方弁６を、管路ｋ６の開閉を行う切換え弁７ａと、管路ｋ７の開閉を行う切換え弁７ｂとに置き換えたものである。
その他の構成は、実施形態の構成要素と同じであるから、同一の構成要素には同一の符号を付して示し、詳細な説明は省略する。 <Modification example>
FIG. 5 shows a schematic diagram of the configuration of the anaerobic digestion system S1 of the modified example.
In the anaerobic digestion system S1 of the modified example, the three-way valve 6 in the anaerobic digestion system S of the embodiment shown in FIG. 1 has a switching valve 7a for opening and closing the conduit k6 and a switching valve 7b for opening and closing the conduit k7. It is replaced with.
Since the other configurations are the same as the components of the embodiment, the same components are designated by the same reference numerals, and detailed description thereof will be omitted.

変形例の嫌気性消化システムＳ１は、循環ポンプ５の下流に接続される管路ｋ５が、管路ｋ６と管路ｋ７とに分岐されている。
管路ｋ６には、開閉を行う切換え弁７ａが設けられている。管路ｋ７には、開閉を行う切換え弁７ｂが設けられている。
変形例の嫌気性消化システムＳ１において、投入汚泥が投入される場合(投入モード)では、切換え弁７ａが開弁され管路ｋ６が解放されるとともに、切換え弁７ｂが閉弁され管路ｋ７が閉塞される。 In the anaerobic digestion system S1 of the modified example, the pipeline k5 connected to the downstream of the circulation pump 5 is branched into the pipeline k6 and the pipeline k7.
The pipeline k6 is provided with a switching valve 7a for opening and closing. The pipeline k7 is provided with a switching valve 7b for opening and closing.
In the anaerobic digestion system S1 of the modified example, when the input sludge is input (injection mode), the switching valve 7a is opened and the pipeline k6 is released, and the switching valve 7b is closed and the pipeline k7 is opened. It is blocked.

これにより、嫌気性消化槽３の消化汚泥は、嫌気性消化槽３の下流の循環ポンプ５に接続される管路ｋ５、管路ｋ６を通って、管路ｋ１に流れ、投入汚泥と合流する。
上記変形例の構成によれば、実施形態の投入モードと同様な作用効果を奏する。
一方、変形例の嫌気性消化システムＳ１において、投入汚泥が投入されない場合(非投入モード)では、切換え弁７ａが閉弁され管路ｋ６が閉塞されるとともに、切換え弁７ｂが開弁され管路ｋ７が解放される。 As a result, the digested sludge of the anaerobic digestion tank 3 flows into the pipe line k1 through the pipe lines k5 and k6 connected to the circulation pump 5 downstream of the anaerobic digestion tank 3, and merges with the input sludge. ..
According to the configuration of the above-described modification, the same operation and effect as the input mode of the embodiment is obtained.
On the other hand, in the anaerobic digestion system S1 of the modified example, when the input sludge is not charged (non-input mode), the switching valve 7a is closed and the pipeline k6 is closed, and the switching valve 7b is opened and the pipeline is opened. k7 is released.

これにより、嫌気性消化槽３の消化汚泥は、嫌気性消化槽３の下流の循環ポンプ５に接続される管路ｋ５、管路ｋ７を通って、管路ｋ２に流れ、熱交換器２に送られ、加温される。
この構成によれば、実施形態の非投入モードと同様な作用効果を奏する。
また、嫌気性消化槽３に固形物の塊りが発生した場合には、切換え弁７ａが開弁され管路ｋ６が解放されるとともに、切換え弁７ｂが閉弁され管路ｋ７が閉塞される。これにより、嫌気性消化槽３の消化汚泥が破砕機１に循環され、破砕機１で破砕される。 As a result, the digested sludge in the anaerobic digestion tank 3 flows to the pipe line k2 through the pipe lines k5 and k7 connected to the circulation pump 5 downstream of the anaerobic digestion tank 3, and flows into the heat exchanger 2. It is sent and heated.
According to this configuration, the same effect as that of the non-input mode of the embodiment is obtained.
When a lump of solid matter is generated in the anaerobic digestion tank 3, the switching valve 7a is opened to open the conduit k6, and the switching valve 7b is closed to close the conduit k7. .. As a result, the digestive sludge of the anaerobic digestion tank 3 is circulated to the crusher 1 and crushed by the crusher 1.

＜＜その他の実施形態＞＞
１．前記実施形態、変形例では、三方弁６または切換え弁７ａ、７ｂを用いて、嫌気性消化槽３の消化汚泥を管路ｋ１または管路ｋ２に切り替えて流す例を説明したが、その他の機械要素を用いて切り替えてもよい。 << Other Embodiments >>
1. 1. In the above-described embodiment and modified example, an example in which the digestive sludge of the anaerobic digestion tank 3 is switched to the pipe line k1 or the pipe line k2 to flow by using the three-way valve 6 or the switching valves 7a and 7b has been described, but other machines It may be switched using an element.

２．本発明は前記の実施形態、変形例に限られるものではなく、特許請求の範囲で様々な形態が含まれる。前記の実施形態は本発明をわかり易く説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。 2. The present invention is not limited to the above-described embodiments and modifications, and includes various forms within the scope of the claims. The above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to those having all the described configurations.

１ 破砕機
２ 熱交換器
３ 嫌気性消化槽
５ 循環ポンプ(循環手段)
６ 三方弁(循環手段、切り替え手段)
７ａ、７ｂ 切換え弁(循環手段、切り替え手段)
１０４ 最終沈殿池
ｋ４、ｋ５、ｋ６、ｋ７ 管路(循環手段)
Ｓ、Ｓ１ 嫌気性消化システム 1 Crusher 2 Heat exchanger 3 Anaerobic digestion tank 5 Circulation pump (circulation means)
6 Three-way valve (circulation means, switching means)
7a, 7b switching valve (circulation means, switching means)
104 Final settling basin k4, k5, k6, k7 Pipeline (circulation means)
S, S1 Anaerobic digestion system

Claims (8)

処理対象の汚泥が加温される熱交換器と、
前記熱交換器で加温された前記汚泥が、嫌気性消化される嫌気性消化槽と、
前記嫌気性消化槽で嫌気性消化された消化汚泥を、前記熱交換器で加温される前の前記処理対象の汚泥と合流させる循環手段とを
備えていることを特徴とする嫌気性消化システム。 A heat exchanger that heats the sludge to be treated,
An anaerobic digestion tank in which the sludge heated by the heat exchanger is anaerobic digested,
An anaerobic digestion system comprising a circulation means for merging the digested sludge anaerobically digested in the anaerobic digestion tank with the sludge to be treated before being heated by the heat exchanger. .. 請求項１に記載の嫌気性消化システムにおいて、
前記熱交換器の上流に、前記処理対象の汚泥を破砕する破砕機を備えている
ことを特徴とする嫌気性消化システム。 In the anaerobic digestion system according to claim 1.
An anaerobic digestion system characterized in that a crusher for crushing the sludge to be treated is provided upstream of the heat exchanger. 請求項２に記載の嫌気性消化システムにおいて、
前記処理対象の汚泥が投入される場合には、前記嫌気性消化槽の前記消化汚泥を、前記破砕機の上流の前記処理対象の汚泥に合流させ、前記処理対象の汚泥が投入されない場合には、前記嫌気性消化槽の前記消化汚泥を前記熱交換器に流れるように切り替える切り替え手段を備えている
ことを特徴とする嫌気性消化システム。 In the anaerobic digestion system according to claim 2.
When the sludge to be treated is thrown in, the digested sludge in the anaerobic digestion tank is merged with the sludge to be treated upstream of the crusher, and when the sludge to be treated is not thrown in. , An anaerobic digestion system comprising a switching means for switching the digestive sludge of the anaerobic digestion tank to flow to the heat exchanger. 請求項３に記載の嫌気性消化システムにおいて、
前記切り替え手段は、
前記処理対象の汚泥が投入されず、かつ、前記嫌気性消化槽で固形物の塊りが発生した場合には、前記嫌気性消化槽の前記消化汚泥が前記破砕機に流れるように切り替える
ことを特徴とする嫌気性消化システム。 In the anaerobic digestion system according to claim 3.
The switching means
When the sludge to be treated is not charged and a lump of solid matter is generated in the anaerobic digestion tank, the digestion sludge in the anaerobic digestion tank is switched to flow to the crusher. Characterized anaerobic digestion system. 熱交換器と嫌気性消化槽と循環手段とを用いて、処理対象の汚泥を嫌気性消化処理する嫌気性消化方法であって、
汚泥が前記熱交換器で加温される過程と、
加温された前記汚泥が前記嫌気性消化槽で嫌気性微生物により嫌気性消化される過程と、
前記嫌気性消化槽の消化汚泥が前記循環手段により、前記熱交換器の上流の前記処理対象の汚泥に合流させる過程とを含む
ことを特徴とする嫌気性消化方法。 An anaerobic digestion method in which sludge to be treated is anaerobic digested using a heat exchanger, an anaerobic digestion tank, and a circulation means.
The process in which sludge is heated by the heat exchanger,
The process of anaerobic digestion of the heated sludge by anaerobic microorganisms in the anaerobic digestion tank,
An anaerobic digestion method comprising a step of merging the digested sludge of the anaerobic digestion tank with the sludge to be treated upstream of the heat exchanger by the circulation means. 破砕機と熱交換器と嫌気性消化槽と循環手段とを用いて、処理対象の汚泥を嫌気性消化処理する嫌気性消化方法であって、
処理対象の汚泥が前記破砕機により破砕される過程と、
破砕された前記汚泥が前記熱交換器で加温される過程と、
加温された前記汚泥が前記嫌気性消化槽で嫌気性微生物により嫌気性消化される過程と、
前記嫌気性消化槽の消化汚泥が前記循環手段により、前記破砕機の上流の前記処理対象の汚泥に合流させる過程とを含む
ことを特徴とする嫌気性消化方法。 An anaerobic digestion method in which sludge to be treated is anaerobic digested using a crusher, a heat exchanger, an anaerobic digestion tank, and a circulation means.
The process of crushing the sludge to be treated by the crusher,
The process of heating the crushed sludge with the heat exchanger,
The process of anaerobic digestion of the heated sludge by anaerobic microorganisms in the anaerobic digestion tank,
An anaerobic digestion method comprising a step of merging the digested sludge of the anaerobic digestion tank with the sludge to be treated upstream of the crusher by the circulation means. 処理対象の汚泥を加温する熱交換器と嫌気性消化槽と循環手段とを用いて、処理対象の 汚泥を嫌気性消化処理する嫌気性消化方法であって、
前記嫌気性消化槽で嫌気性消化が行われた消化汚泥が、前記循環手段により、前記熱交換器に送られる過程と、
前記嫌気性消化槽の消化汚泥が前記熱交換器で加温される過程と、
加温された前記消化汚泥が前記嫌気性消化槽で嫌気性消化される過程とを含む
ことを特徴とする嫌気性消化方法。 An anaerobic digestion method in which the sludge to be treated is anaerobic digested using a heat exchanger that heats the sludge to be treated, an anaerobic digestion tank, and a circulation means.
A process in which digested sludge subjected to anaerobic digestion in the anaerobic digestion tank is sent to the heat exchanger by the circulation means.
The process of heating the digestive sludge in the anaerobic digestion tank with the heat exchanger,
An anaerobic digestion method comprising a process in which the heated digestive sludge is anaerobic digested in the anaerobic digestion tank. 破砕機と熱交換器と嫌気性消化槽と循環手段とを用いて、処理対象の汚泥を嫌気性消化処理する嫌気性消化方法であって、
前記嫌気性消化槽で消化が行われた消化汚泥が、前記循環手段により、前記破砕機に送られる過程と、
前記破砕機で、前記消化汚泥が破砕される過程と、
破砕された前記消化汚泥が前記熱交換器で加温される過程と、
加温された前記消化汚泥が前記嫌気性消化槽で嫌気性消化される過程とを含む
ことを特徴とする嫌気性消化方法。 An anaerobic digestion method in which sludge to be treated is anaerobic digested using a crusher, a heat exchanger, an anaerobic digestion tank, and a circulation means.
The process in which the digested sludge digested in the anaerobic digestion tank is sent to the crusher by the circulation means, and
The process of crushing the digested sludge with the crusher and
The process of heating the crushed digestive sludge with the heat exchanger,
An anaerobic digestion method comprising a process in which the heated digestive sludge is anaerobic digested in the anaerobic digestion tank.
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